Absorbent-material-sizing composition.



an amine PATENT onnron.

ERNST FUES, OF HANAU-ON-THE-MAIN, GERMANY.

ABSORBENT-MATERIAL-SIZIN Gr COMPOSITION.

No Drawing.

.at the same time a certain quantity of animal size. In the course of my experiments on the subject I have found that particularly colloidal substances possess the said property of preventing precipitation. The substances which, according to my present invention, are suitable for that purpose will, therefore, in the following specification be termed briefly as protective colloids.

My invention, which is based on the aforesaid observation, consists in operating the sizing of absorbent material by means of a mixture of various solutions which contain the following:

(a) Precipitable sizing-agents, for instance solutions of fatty acids or rosin acids, shellac, albumen, casein or the like;

(12) Substances having the property of preventing precipitation of the sizingagents and thus acting as protective colloids, for instance animal size, gum arabic or the like;

(0) Precipitants, for instance alum, sulfate of alumina, and other acid salts or acids, or the like.

These mixtures are almost entirely clear-* sometimes somewhat opalescentif they are prepared in the proper proportion which must, of course, be varied according to the kind and number of components used, and for which, with due regard to the variations caused by local conditions, no standard can be given. The mixtures contain the sizing agents in an ultramicroscopically fine state and must be regarded as so-called pseudosolutions rather than as proper solutions.

If, for instance, unsized paper is dipped in a solution as above described (for instance in a solution composed of rosinsize, animal-size and sulfate of alumina) and, after squeezing, dried in the usual manner Specification of Letters Patent. Patented Aug, 20, 1918, Application filed June 15, 1914. Serial No. 845,321.

over drying-cylinders, the paper will be perfectly and qnite evenly sized, thisfrequiring only a portion of the quantity of size necessary when using the ordinary method of rosin-sizing the paper-pulp while it is in the beater. This may be easily understood considering the extraordinary fineness of the particles of the size in" the pseudo solution, and considering the fact that by this method of sizing with protective colloids any losses of the material are entirely avoided. v 7

Another advantage of this new sizing method is that it gives satisfactory results,

even if water-hardening agents, such as Caor Mg-salts, are present, which would ren-' der the ordinary method of rosin-sizing i1n--.-

practicable. I

The process may be applied either to any entirely finished (unsized) paper or to paper while it is made on the paper.- machine. In

either case the disadvantage of, repeatedly having to moisten and dry the-finished paper is only an apparent one, which is counterbalanced, if not outweighed, by thegreat advantages which offer the working of unsized paper on the paper-machine. These advantages are quite obvious and consist in the fact that the whole wet-part of the paper-machine (strainer, wirecloth, screen'sv and felts) are much less soiled and blocked i than in cases where sized paper is worked and that the screens and felts are kept in good condition for a longer time and, thereby interruptions of working avoided, 'although the paperweb is more rapidly drained and dried (at higher temperature) whereby it is possible to accelerate the work ing and produce larger quantities of paper in a given time.

The method of sizing with protective colloids is of particular advantage in the sizing of hand-made paper, because it effects a considerable saving of animal-size, and moreover it is superior in regard to the stability of the size-mixture as compared with the pure animal-size used with other methods. Moreover the hand-made papers sized .according to the new process can be more rapidlydried than those sized with animal size.

The new method can be utilized with advantage not only in the manufacture of papers and card-boards, but also in the prep aration of any other absorbent material, for instance for the impregnation of fabrics or the like, which could hitherto be effected only in two separate consecutive operations,

According to my new process the imprega nationis effected in a single operation which renders the whole process considerably cheaper.

In further developing the idea underlying my invention, I have found that it is technically possible to combine with the above described sizing-method a dyeing process, namely by adding dyestufl solutions to the sizing liquid. The protective colloids contained in the sizing-liquid possess the peculiar property of rendering it possible to use simultaneously dyestufl's belonging to different classes which, in absence of the protective colloids, would be precipitated by'each other; thus a green color can be obtained by simultaneously using a basic yellow and an acid blue dye'stuff as an admixture to the sizing liquid.

Claims:

1. An absorbent material sizing composition containing a sizing medium precipitable by acid substances, acid precipitating means, and a small quantity of a suitable protective colloid, for the purpose described.

2. An'absorbent material sizing composition containing a vegetablesizing medium precipitable by acid substances, said precipitating means, and a small quantity of a suitable protective colloid, for the purpose described.

3. An absorbent material sizing composition containing a sizing medium precipitable by acid substances, acid precipitating means, and a small quantity of animal size, for the purpose described.

4. An absorbent material sizing composition containing a sizing medium p'recipitable by acid substances, acid precipitating means,

a dye stuff, and a small quantity 0 a suitable protective colloid, for the purpose described.

5. An absorbent material sizing composition containing a sizing medium precipitable by acid substances, acid precipitating means, dye stuff, and a small quantity ofanimal size, for the purpose described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

ERNST Witnesses JEAN GR ND, KARL GRUND.

(Copies or this patent may be obtained. tor. five cents each, by addressing the flomssloaer of yate nte,

- Washington, JD). (13. 

